01 - Line a standard baking sheet with parchment paper for easy release.
02 - In separate microwave-safe bowls, heat dark chocolate and white chocolate in 30-second increments, stirring thoroughly between each, until silky smooth.
03 - Melt green, purple, and orange candy melts individually, using microwave instructions on packaging until fluid.
04 - Pour melted dark chocolate onto the prepared baking sheet and use a spatula to evenly distribute into an 8x10-inch rectangle.
05 - Drizzle white chocolate across the dark chocolate layer, then drag a toothpick or skewer through both to create a marble pattern.
06 - Drizzle melted green, purple, and orange candy melts over the chocolate to form vibrant streaks and whimsical swirls.
07 - While chocolate is still melted, arrange pretzel sticks in pairs to resemble witch legs and press green gummy candies at the ends as shoes.
08 - Scatter Halloween sprinkles, edible glitter or sanding sugar, and mini marshmallows across the chocolate bark.
09 - Lightly press all decorations into the melted chocolate base to ensure adhesion.
10 - Allow the chocolate bark to firm up at room temperature or refrigerate for about 30 minutes until completely hardened.
11 - Break bark into irregular pieces and present for serving.